We really just need to design a ship with a 100 meter saucer and two relatively small secondary hulls to ether side allowing a 12 deck large warp core to straddle the entire ship through both secondary hulls.
One hull is a flight deck hull. The other has the deflector and a big engineering section.
Then mount a large cargo pod between the secondary hulls.
Give it a pair of nacelles in cargo pod configuration.
It has speeds of warp around 6/7/7.6 (E cruise / M cruise / Max warp)
I know. Non orb warp 8 Archer feels wrong, but I feel Starfleet procurement will want to kill me 60% less than if I sent them another orb.
I think it would be a cool looking engineering ship to update the Archer concept for a warp 8 world.
We arent designing a new Archer before the nextgen nacelles roll out in the 2270s, so warp 7+ cruise is likely, with warp 8 max cruise a small but distinct possibility
And I dont see the point of undersizing a cargo hauler and engineering ship
If I had to do it?
NEXT ARCHER(2295)
180m Federation saucer, XL variant, Rising Slope configuration, engineering hull: 270 kt
Large cargo pod: +100 kilotons
Cruise/catamaran nacelles: +20 kilotons: 12 pts
Standard covariant shields: 30.8 pts(without nacelles and cargo pod), 44.5 pts (with nacelles and cargo pod),
Large warp core: 12pts
4x Type 3 impulse thrusters: Mature: 15pts
8x type 5 phasers: Mature: 24 pts
2x type 4 torpedoes(1 forward, 1 aft): Mature: 6pts
Flight deck is transverse in the saucer instead of longitudinal, and youd want extra AM to exploit that max cruise
Then you stack the engineering modules
Thats a 390 kiloton ship(290 without pod) that costs either 54.8 pts or 68.5 points before thrusters and weapons,
99 pts or 113 pts after them but before mass production discounts,
Can do large supply runs without the pod, and is carrying a mix of phasers and shields enough to fend off a B'rel or two long enough to run
You could save 10 to 15 points of cost by going with light covariant shields, 6 pts by accepting more phaser blindspots, and another 7.5 pts by halving impulse drives but that seems like one of those penny-pinching measures thats a false economy in the light of the pattern of Archer losses during the war